sysdeps/unix/sysv/linux/i386/getresgid.c

   1 /* Copyright (C) 1998,2000,2002,2003,2005,2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <unistd.h>
  20 #include <sys/types.h>
  21
  22 #include <linux/posix_types.h>
  23
  24 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26 #include <bp-checks.h>
  27
  28 #include <kernel-features.h>
  29
  30 #ifdef __NR_getresgid
  31
  32 # ifdef __NR_getresgid32
  33 #  if __ASSUME_32BITUIDS == 0
  34 /* This variable is shared with all files that need to check for 32bit
  35    uids.  */
  36 extern int __libc_missing_32bit_uids;
  37 #  endif
  38 # endif /* __NR_getresgid32 */
  39
  40
  41 int
  42 __getresgid (gid_t *rgid, gid_t *egid, gid_t *sgid)
  43 {
  44 # if __ASSUME_32BITUIDS > 0
  45   return INLINE_SYSCALL (getresgid32, 3, CHECK_1 (rgid),
  46                          CHECK_1 (egid), CHECK_1 (sgid));
  47 # else
  48   __kernel_gid_t k_rgid, k_egid, k_sgid;
  49   int result;
  50 #  ifdef __NR_getresgid32
  51   if (__libc_missing_32bit_uids <= 0)
  52     {
  53       int r;
  54       int saved_errno = errno;
  55
  56       r = INLINE_SYSCALL (getresgid32, 3, CHECK_1 (rgid),
  57                           CHECK_1 (egid), CHECK_1 (sgid));
  58       if (r == 0 || errno != ENOSYS)
  59         return r;
  60
  61       __set_errno (saved_errno);
  62       __libc_missing_32bit_uids = 1;
  63     }
  64 #  endif /* __NR_getresgid32 */
  65
  66   result = INLINE_SYSCALL (getresgid, 3, __ptrvalue (&k_rgid),
  67                            __ptrvalue (&k_egid), __ptrvalue (&k_sgid));
  68
  69   if (result == 0)
  70     {
  71       *rgid = (gid_t) k_rgid;
  72       *egid = (gid_t) k_egid;
  73       *sgid = (gid_t) k_sgid;
  74     }
  75
  76   return result;
  77 # endif
  78 }
  79 libc_hidden_def (__getresgid)
  80 weak_alias (__getresgid, getresgid)
  81
  82 #else
  83 # include <posix/getresgid.c>
  84 #endif